Anthropologist Madhumala Chattopadhyay spent six years documenting the tribes of the Andaman Islands.

The recent death of an American missionary on North Sentinel Island has put the remote island in the Bay of Bengal, officially off-limits to most outsiders for decades, back in the news and raised questions about the future of the Sentinelese, the island’s hunter-gatherer residents who have resisted outside contact for most of their known history.